wdt_mpc8xx documentation

wdt_mpc8xx documentation

[Robin Gilks]

Greetings

Whilst rummaging about the PPC development tree I came across the
Siemens/SGI/Denx watchdog driver for the mpc8xx. It references a man
page which so far I've not been able to find (man wdt_mpx8xx(4)) so I'm
a bit clueless about what the monitor chain code does.

It doesn't seem to relate to the generic watchdog_api.txt in the kernel
documentation (at least the defines don't seem to tie in with any of the
  ioctl options).

Any help here appreciated.

--
Robin Gilks
Senior Design Engineer          Phone: (+64)(3) 357 1569
Tait Electronics                Fax  :  (+64)(3) 359 4632
PO Box 1645 Christchurch        Email : robin.gilks@tait.co.nz
New Zealand


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Re: wdt_mpc8xx documentation

[Andreas Oberritter]

Hi Robin,

Have a look at our driver, which uses the kernel's watchdog api:
http://cvs.tuxbox.org/cgi-bin/viewcvs.cgi/*checkout*/tuxbox/cdk/Patches/linux-2.4.23-pre6-m8xxwdt.diff?rev=HEAD&content-type=text/plain

It will probably never get into vanilla 2.4 because Marcelo doesn't
respond to my Emails. However, it is really stable since months...
What other driver were you talking about?

Tom, would you put this driver into the 2.4 ppc trees if I rediffed it?

Regards,
Andreas



On Thu, 2003-12-18 at 05:32, Robin Gilks wrote:
> Greetings
>
> Whilst rummaging about the PPC development tree I came across the
> Siemens/SGI/Denx watchdog driver for the mpc8xx. It references a man
> page which so far I've not been able to find (man wdt_mpx8xx(4)) so I'm
> a bit clueless about what the monitor chain code does.
>
> It doesn't seem to relate to the generic watchdog_api.txt in the kernel
> documentation (at least the defines don't seem to tie in with any of the
>   ioctl options).
>
> Any help here appreciated.
>
> --
> Robin Gilks
> Senior Design Engineer          Phone: (+64)(3) 357 1569
> Tait Electronics                Fax  :  (+64)(3) 359 4632
> PO Box 1645 Christchurch        Email : robin.gilks@tait.co.nz
> New Zealand
>
>
>


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Re: wdt_mpc8xx documentation

[Tom Rini]

On Thu, Dec 18, 2003 at 06:52:46AM +0100, Andreas Oberritter wrote:
> Hi Robin,
>
> Have a look at our driver, which uses the kernel's watchdog api:
> http://cvs.tuxbox.org/cgi-bin/viewcvs.cgi/*checkout*/tuxbox/cdk/Patches/linux-2.4.23-pre6-m8xxwdt.diff?rev=HEAD&content-type=text/plain
>
> It will probably never get into vanilla 2.4 because Marcelo doesn't
> respond to my Emails. However, it is really stable since months...
> What other driver were you talking about?
>
> Tom, would you put this driver into the 2.4 ppc trees if I rediffed it?

Have there been any updates since the last one you sent me?  I've
actually got it in a tree I'm going to get Marcelo to pull from.
Thanks.

--
Tom Rini
http://gate.crashing.org/~trini/

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Re: wdt_mpc8xx documentation

[Andreas Oberritter]

On Thu, 2003-12-18 at 17:13, Tom Rini wrote:
> > Tom, would you put this driver into the 2.4 ppc trees if I rediffed it?
>
> Have there been any updates since the last one you sent me?  I've
> actually got it in a tree I'm going to get Marcelo to pull from.
> Thanks.

That's great news! The driver has not been not changed since then. The
last patch I sent to you was for 2.4.23-pre7 I think. Thank you!

Regards,
Andreas


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Re: wdt_mpc8xx documentation

[Robin Gilks]

Andreas Oberritter wrote:
> On Thu, 2003-12-18 at 17:13, Tom Rini wrote:
>
>>>Tom, would you put this driver into the 2.4 ppc trees if I rediffed
>>>it?
>>
>>Have there been any updates since the last one you sent me? I've
>>actually got it in a tree I'm going to get Marcelo to pull from.
>
> That's great news! The driver has not been not changed since then. The
> last patch I sent to you was for 2.4.23-pre7 I think. Thank you!

My reading of your code interprets the resetting of the watchdog as
being from the real-time clock interrupt. This block does not exist on
newer 8xx CPUs so it looks like I'm going to have to hack the code about
a bit for 859/866 CPUs at least.

Maybe I've missed something - I'd be interested in your feedback (after
the Christmas break!!).

--
Robin Gilks
Senior Design Engineer          Phone: (+64)(3) 357 1569
Tait Electronics                Fax  :  (+64)(3) 359 4632
PO Box 1645 Christchurch        Email : robin.gilks@tait.co.nz
New Zealand

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Re: wdt_mpc8xx documentation

[Wolfgang Denk]

In message <3FE12DCD.10609@tait.co.nz> you wrote:
>
> Whilst rummaging about the PPC development tree I came across the
> Siemens/SGI/Denx watchdog driver for the mpc8xx. It references a man
> page which so far I've not been able to find (man wdt_mpx8xx(4)) so I'm
> a bit clueless about what the monitor chain code does.

In the top directory of the Linux source tree, type:

	man Documentation/man4/wdt_mpc8xx.4

> It doesn't seem to relate to the generic watchdog_api.txt in the kernel
> documentation (at least the defines don't seem to tie in with any of the
>   ioctl options).

You are right; this watchdog driver provides  a  very  different  API
with a few pretty powerful options (like escalation strategies etc.)

> Any help here appreciated.

Hope this helps.

Best regards,

Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
A fanatic is a person who can't change his mind and won't change  the
subject.                                          - Winston Churchill

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